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from japan. the japanese changed their vaccine schedule in 1993, replacing the mmr triple shot with three separate vaccinations. but following the change, autism rates did not fall. in fact, they appeared to rise, thus making the triple shot an unlikely cause of autism. the danish team now went on to investigate the second theory: the mercury preservative thimerosal. it turned out that in denmark there was a simple way to test this as well. >> in denmark, since the '70s, only one vaccine has contained thimerosal, and that was a pertussis vaccine. it contained thimerosal until may-june '92. then the same vaccine continued but without thimerosal. >> narrator: hviid and colleagues found that children who were given pertussis vaccines with thimerosal before 1992 had identical autism rates as children who received mercury-free vaccines after that date. >> we did not find any association between being vaccinated with the... the thimerosal-containing vaccine and the risk of autism. >> narrator: other studies in the us, the uk and canada also found no association between autism and thi
Search Results 0 to 1 of about 2 (some duplicates have been removed)

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